Vocab 2.1 Flashcards
Cable
A strong rope, usually made of metal, designed to have great
tensile strength and to be used in structures.
Centroid
The geometric center of an area.
Compression Force
A body subjected to a push.
Concurrent Force
Systems
A force system where all of the forces are applied at a
common point on the body or having their lines of action with
a common intersection point.
Cross-Sectional Area
A surface or shape exposed by making a straight cut through
something at right angles to the axis.
Direction
The direction of a vector is defined by the angle between a
reference axis and the arrow’s line of direction.
Fixed Support
A support that prevents translation and rotation in a beam.
Flange
A broad ridge or pair of ridges projecting at a right angle from
the edge of a structural shape in order to strengthen or stiffen
it.
Free Body Diagram
A diagram used to isolate a body from its environment,
showing all external forces acting upon it.
Gusset
A plate or bracket for strengthening an angle in framework.
Joint
The connection points of members of a truss.
Magnitude
The absolute value of a number.
Member
Slender straight pieces of a truss connected by joints.
Method of Joints
A method of analysis of trusses which constructs free body
diagrams of each joint and determines the forces acting in
that joint by considering equilibrium of the joint pin.
Moment
The turning effect of a force about a point equal to the
magnitude of the force times the perpendicular distance from
the point to the line of action from the force.`
Moment of Inertia
A mathematical property of a cross section that is concerned
with a surface area and how that area is distributed about a
centroidal axis.
Newton’s First Law
Every body or particle continues at a state of rest or uniform
motion in a straight line, unless it is compelled to change that
state by forces acting upon it.
Newton’s Second Law
The change of motion of the body is proportional to the net
force imposed on the body and is in the direction of the net
force.
Newton’s Third Law
If one body exerts a force on a second body, then the second
body exerts a force on the first body which is equal in
magnitude, opposite in direction, and collinear.
Pinned Support
A support that prevents translation in any direction.
Planar Truss
A truss that lies in a single plane often used to support roofs
and bridges.
Resultant Force
The resultant of a system of force is the vector sum of all
forces.
Roller Support
A support that only prevents a beam from translating in one
direction.
Scalar
A physical quantity that has magnitude only.
